Rotate 2-D matrix by 90

Given N*M matrix, rotate it by 90 degree right

package core.geeks;

class Rotate90Degree {

      

       private static void rotateMatrix(int[][] array) {

              int oRow = array.length;

              int oCol = array[0].length;

              int[][] tArr = new int[oCol][oRow];

              int tCol = 3;

              for (int i = 0; i < oRow; i++){

                     for(int j = 0;  j < oCol; j++){

                           tArr[j][tCol] = array[i][j];

                     }

                     tCol--;

              }

              printGrid(tArr);

       }

      

       public static void main(String args[] ) throws Exception {

              int[][] array = {  {0, 1, 2, 3, 4},

                           {5, 6, 7, 8, 9},

                           {10, 11, 12, 13, 14},

                           {15, 16, 17, 18, 19}};

              rotateMatrix(array);

       }

       public static void printGrid(int[][] a) {

              for(int i = 0; i < a.length; i++) {

                     for(int j = 0; j < a[i].length; j++) {

                           System.out.printf("%5d ", a[i][j]);

                     }

                     System.out.println();

              }

       }

}

Output:

   15    10     5     0

   16    11     6     1

   17    12     7     2

   18    13     8     3

   19    14     9     4